Yes, 4831 the regression and 4710 is the outstanding critical bug. There
is now 4840 too, but that is looking like the issue is maybe not a Squid
bug.

FYI: the "Open Bugs" section at the end of
<https://wiki.squid-cache.org/Squid-4> (or similar for each Squid
version) links to the two bug lists I work from. They are also on the
RoadMap page for beta and alpha/development versions.